Electric Power Generation, Transmission, and Distribution

fAAP¼

m 0

2 p

IAln

DAP

GMRA



ðÞWb=m (13:41)

fABP¼

m 0

2 p

IBln

DBP

DAB



ðÞWb=m (13:42)

fACP¼

m 0

2 p

ICln

DCP

DAC



ðÞWb=m (13:43)

The corresponding flux linkage of conductor A at pointP(Fig. 13.12) is evaluated as

lAP¼lAAPþlABPþlACP (13:44)

having

lAAP¼

m 0

2 p

IAln

DAP

GMRA



ðÞWb=m (13:45)

A B C

fA f (^) B f (^) C
DAB DBC
DCA
X X X
FIGURE 13.11 Magnetic flux produced by each conductor in a three-phase system.
C
DAP
B
P
lAAP
lABP lACP
PP
DAC
DAP DAP DCP
DBP
A A
B B
C C
(a) (b) (c)
A
DAB
FIGURE 13.12 Flux linkage of (a) conductor A at pointP, (b) conductor B on conductor A at pointP, and (c)
conductor C on conductor A at pointP. Three-phase system.